2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
thawj cov phom loj uas tau txheeb pom tias yog cov neeg tua hluav taws tau tsim nyob rau hauv lub xyoo pua 16thua riam phom nruab nrab ntawm qhov chaw tiaj tus (qhov hluav taws kub ncaj qha) ntawm rab phom loj thiab lub siab trajectory (indirect hluav taws) ntawm mortars.
Qhov txawv ntawm rab phom thiab lub tshuab ua pa yog dab tsi?
Cannon tau dhau los ua cov lus dav dav rau cov foob pob tawg loj. Ib rab phom yog ib rab phom uas tsim los tua hluav taws nyob rau hauv ib lub tiaj tiaj, lub howitzer yogib daim luv tsim los pov pob tawgnyob rau hauv ib qho kev sib tw, thiab lub mortar yog ib qho luv luv rau kev tua ntawm qhov siab tshaj 45°.
Leej twg siv howitzers hauv ww1?
Big Bertha, German Dicke Bertha, hom 420-mm (16.5-nti) howitzer uas yog thawj zaug siv los ntawm German tub rograu foob pob Belgian thiab Fabkis forts thaum lub ntiaj teb War I.
Puas siv lub tshuab ua haujlwm ww2?
Teb Chaws Asmeskas cov tub rog niaj hnub yog kev tsom mus rau cov phom loj nyob rau hauv interwar era thiab M114, 155mm howitzer, tau tsim nyob rau lub sijhawm rau nws nkag mus rau Tsov Rog Ntiaj Teb Zaum Ob. Cov phom no, uas tau tsim thiab tsim nyob rau ntawm Rock Island Arsenal, tuaj yeem tua plaub zaug ib feeb, tab sis muaj qhov deb ntawm ze li 15 km.
Lub mortar tau tsim thaum twg?
Tus qauv ntawm cov mortar niaj hnub yog riam phom peb-nti tsim los ntawm tus neeg Askiv Wilfred Stokes hauv 1915. Qhov no muaj ib tug du-bored raj, so raws li ib tug baseplate thiab txhawb los ntawm ib tug bipod, uas muajib tug ruaj firing pin ntawm nws breech kawg.
Pom zoo:
Thaum twg lub tshuab xaws lockstitch tau tsim?
Elias Howe patented thawj zaug lockstitch tshuab xaws hauv ntiaj teb hauv 1846. Nws qhov kev tsim kho tau pab kev tsim cov tshuab xaws thiab khaub ncaws ntau. Leej twg invented lock stitch? Elias Howe Jr. (1819–1867) yog ib tus neeg tsim khoom ntawm thawj lub tshuab xaws ua haujlwm.
Los ntawm cov khoom tsim thaum lub sij hawm tsim cov bakelite yog?
Nyob rau hauv rooj plaub ntawm bakelite phenol thiab formaldehyde condense los tsim cov monomer muab H2O raws li cov khoom lag luam. Bakelite tseem hu ua co-polymer. Cov tshuaj tiv thaiv: Phenol reacts nrog formaldehyde los tsim o-Hydroxy methyl phenol.
Thaum twg yog lub tshuab hu xov tooj tau tsim?
Nws yog cov cuab yeej tsim khoom lag luam rau cov neeg sawv cev hauv xov tooj. Tus thawj semi-automatic dialer tau muaj nyob rau hauv kev lag luam lag luam hauv 1942. Nws yog manually ua thiab tuaj nyob rau hauv ob lub qauv; ib qho uas khaws 12 tus lej thiab ib tus thib ob uas khaws tau txog 52 tus lej.
Thaum twg cov xaum siv tshuab tau tsim?
John Hawkins thiab Sampson Mordan Thawj Patent Tus Mechanical Pencil. Silver S. Mordan & Co txhua yam cwj mem nrog cov cim rau 1825. Thaum twg yog tus cwj mem tshuab tsim tawm? Silver S. Mordan & Co txhua yam cwj mem nrog cov cim rau 1825.
Thaum twg cov tshuab ziab plaub hau tau tsim?
In 1888, Alexandre-Ferdinand Godefroy, tus kws tshaj lij Fab Kis Fab Kis - tus kws tsim plaub hau plaub hau - patented lub tshuab ziab khaub ncaws thawj poj koob yawm txwv. Lub contraption yuav tsum tau txuas mus rau "rau txhua yam tsim nyog lub rhaub,"
